Manufacture of mucilage or gum.



- numberof vegetable products, seeds, barks,

um'rnn STATES PATENT OFFICE.

CONRAD VARLEY GREENWOOD, OF BLUNDELLSANDS, NEAR LIVERPOOL, ENGLAND,

ASSIG-NOR TO ALFRED STAMFORD WHITE, 0F CHICAGO, ILLINOIS.

MA NUFACTURE- OF MUCILAGE' OR GUM.

No Drawing.

To all whom it may concern Be it known that I, CONRAD VARLEY GREENWOOD, a subject of the King of Great Britain, residing at Blundellsands, near Liverpool, in the county of Lancaster, in the Kingdom of England, have invented cer tain new and useful Improvements in the Manufacture of a New Mucilage or Gum, of which'the following is a specification.

This invention relates to anew or improved mucilage and consists in treating solutions of colloidal carbohydrates obtained from vegetable products, seeds, barks and rhizomes or extracts from any of thesewith tannic acid or solutions thereof or extracts containing the same vhereby the resulting article is capable of eing used in numerous arts in a very advantageous manner.

'As is well known gummy or mu'cilaginous solutions result from the treatment of a and rhizomes with water under various conditions of temperature and pressure. Such products are for instance obtained from the kernels of the locust bean by treatments and processes described in specifications of Patents No. 924319, Serial No. 470663 filed J an-' uary 4th, 1909, and Serial No; 579137 filed August 26th, 1910, and are sold in various forms as tragasol In carrying our my invention as applied to solutions of gum tragasol, a solutionof tannic acid is added in the proportion of about twice the weight of the acid to the tragasol solids; These two ingredients are now mixed together which causes a precipitation of the new product to take place according to the temperature of the mixture.

en in a cold state the compound separates in the form of a curd, which agglomerates and shrinks, which allows of a satisfactory separation of the mother liquor.

This mother liquor may be rejected, if desidable, or should it contain a suflicient proportion oftannic acid (excess) it may again be used to dissolve or dilute the precipitant in a subsequent operation. Theproduct'thus obtained is insoluble in cold water, 2'. e. only in suspension; on warming, however, it dissolves; in which state it is more transparent. This is one of the peculiarities of the product.

The product can be obtained in various gradations; when the tannic acid is used Specification of Letters Patent.

in the proportions indicated, or in excess,

the product 1s easily separated; but for some processes 1t is preferable to employ smaller proportlons of tannlc acid, so as to form a compound in solution or emulsion but without complete separation, but it Wlll be obvious that any proportions of tannic acid The invention it will be seen is applicable to a large number of industries, among which I might mention the. printing and .fimslnng of vegetable or other textiles, and

specially to give glazed and filled finishes, such as are required for book cloth; the

dyeing of textiles in which case it is used as a thickening for the dye liquors possessing fixative properties; as tanningagents, 2'. e. for treating skins for the preparation of leather and leather dressing, and owing to its colloidal nature the invention can be utilized for emulsifying oils and waxes and may therefore be used as a base for polishes, in the sizing of papers and for sizing wood surfaces as a ground for varnishes:

In connection with anilin and other colors or dyestuffs, it can be used in the production of colored lakes.

I declare that what I claim is 1. As a new article of manufacture, a product produced by adding tannic acid to a soluble colloidal vegetable carbohydrate, the product being characterized by being soluble in hot or warm water but insoluble in' cold.

2. As a new article of manufacture, a pre cipitated product produced by the addition of tannic acid to'a;solu tion ofa colloidal vegetable carbohydrate, the product being characterized by being soluble in hot or warm water but insoluble in cold.

3, As a new article of manufacture,- a mucilaginous product produced as a precipitate from a mixture of tann-ic acid and a solution of acolloidal vegetable carbohydrate, said product being characterized by it's insolubility in cold water and its solubility in. warmwater.

4. The process of manufacturing a new composition ofmatter soluble in hot or warm water, which consists in mixing a solu- Patented July 28, 1914. I Application filed February 23, 1911. Serial No. 610,397.

tion of soluble colloidal vegetable carbohydrates withvtannic acid; and finally separat.- ing the precipitate roduced.

'5. The process producing a new composition of matter soluble in'hot or warm water, which consists in producing a soluble colloidal carbohydrate from' rawvegetable matter dissolving the same; adding tannic acid'to such solution; and finally separating the composition of matter in the form of a .-precipitate thrown down in the solution.

I ,its solubility in warm water. L

of gum tragasol, said product being charac-' terized by its insolubility in cold water and 9.The' process of mapufacturing a new composition of matter, which ,consistsinmixing a solution of-gum tragasol with tann'1c acid, and finally separating the precipitate produced producing a solution ofa a 10. The process of producing a new com- 30 position of matter, which consists in produc-.

ing soluble gum tragasol from raw vegetable matter; dissolving the same,- adding tannic acid to such solution, and finally separating the compositlon ofmatter in the form of a,

precipitate thrown down'inthefsolution.

'11. The process of manufacturing a new composit1on of matter, consists in lloidal carbohydrate from raw vegetab matter, treating said-solution with tannic' a d so as to form two phases,'the first of which is a. dilute aqueous phase and the 'sepo'nd a gelatinous precipitate forming-curdy masses, and fin ally separatin the composition of matter in the form of id second phase. a

12. The process of manufacturing a new I composition. of matter, which consists in treating a solution of a collodial vegetable carbohydrate with tannic acid so" as to pro duce two phases, the first of which is a -dilute aqueous phase and the second of which is a gelatinous precipitate occuring as curdy' masses, and separating the new composi-;

tion ofinatter as said second phase;

13. The process of producing a new com position of matter, which consists in treatin a solution of'a colloidal vegetable car'- bo ydrate with an' excess of tannic acid, the concentrations of the reacting substances being so chosen that a gelatinous curdy precipitate is. reduced which is then separated from the llute aqueous phase.

14:. 'Therocess of producing a new composition 0 matter, which consists in treating a solution of acolloidal vegetable car bohydrate with .tannic acid in "such manner as to precipitate a coherent col loidal mass, which mass, when eparated from the dilute aqueous phase, possesses they" solubility in warm water to yield a transproperty of insolubility in cold water and parent solution.-

15; The process of producting anew co'ni position of matter, whicl1 consists treat: ing a solution of gum tragasol w1th tann1 c acid in such manneras to precipitate a coherent colloidal mass, which mass when separated from the dilute aqueous phase, possesses the propertyof insolubllity in cold water and solubility m-warm wate'rto yield a transparent solution 16. A' new composition of matterawhich consists of a'colloidal mass having'the propert of insolubility in cold water and solubihty in warm water','said massbemg pro duced -from a solutionof a colloidal vege-' table carbohydrate and tannic acid, sub

stantially as described.

In 'WllillGSS whereof, I have hereunto signed my name this 15th day of February.

1911, in the presence of two subscribing! witnesses. I I

CONRAD VAR-LEI GREENWOOD; Witnesses:

1 H. S. SHOOBRIDGE, 'LMcLAomAN. 

